Portsmouth Weather in January
January in Portsmouth brings high temperatures, with daytime highs of 27°C (81°F) and nights around 24°C (75°F). The perfect weather makes it a solid choice for a visit.
Rainfall in Portsmouth in January
Records from the past 30 years suggest around 18 days of rain, with 49 mm (1.9 in) average for the month. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Portsmouth in January
The temperature in Portsmouth in January is perfect. Daytime highs reach 27°C (81°F), with nights dropping to 24°C (75°F). Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 24°C (75°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Portsmouth in January
With approximately 199 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July and December typically offer the best weather for Portsmouth.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Dominica, check out our Portsmouth's climate page.
Portsmouth Temperature in January
Min Temperature
24°C (75°F)
Max Temperature
27°C (81°F)
Chance of Rain
61%
Precipitation
49 mm (1.9 in)
Rainy days
18 days
Humidity
70% *
Sunshine
199 hours *
Percentage Sunshine
*
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Portsmouth typically stay consistent throughout January, with daily highs averaging around 27°C (81°F). Nights are warm, with lows around 21°C (70°F).
Average temperatures in January
Historical weather for Portsmouth in January
Browse day-by-day weather records for Portsmouth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portsmouth historical weather extremes in January
Based on weather observations in Portsmouth between 1976 and 2025, these are the recorded extremes during January.
- Portsmouth recorded its highest January temperature of 31°C (88°F) on January 4, 1996.
- Portsmouth experienced its chilliest January day on January 7, 1978, reaching only 23°C (73°F).
- Nighttime temperatures dropped to 15°C (59°F) on January 28, 1976, marking the coldest January night on record.
Best Places in Dominica in January
Find out more about the weather in Dominica and which places have the best travel conditions in this month. See all of Dominica in January →
perfect weather
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unpleasant
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What to Wear in Portsmouth in January
Warm weather calls for comfortable, breathable clothing in January. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Rain is likely on several days, so bring a good rain jacket. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Portsmouth in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Dominica, check out our Portsmouth's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in Dominica.
